Why free shipping makes you spend more

The threshold is the whole game

Free shipping on every order is one thing.

Free shipping over $100 is something else.

The $100 is there to move your cart.

If most customers are spending around $70 or $80, putting free shipping at $100 gives them a reason to add something else.

So when the website says:

“You’re only $14 away from free shipping.”

It is not just helping you out.

It is giving you a choice.

Pay us $9 for delivery.

Or give us another $14 for something we sell.

A lot of people choose the second one.

Shopify reports that 80% of online shoppers are willing to meet a minimum purchase threshold to avoid shipping costs.

Shipping feels like wasted money

This is probably why it works so well.

Paying $15 for another product does not feel the same as paying $15 for delivery.

At least with the product, you get something.

Shipping feels like a fee attached to something you already decided to buy.

So:

$59 item + $9 shipping

can somehow feel worse than:

$72 worth of stuff + free shipping

Even though the second order costs more.

You spent an extra $13.

But the shipping was free.

That feels like winning.

The number is usually close enough on purpose

The threshold only really works if it feels reachable.

Set it too low and everyone qualifies anyway.

Set it too high and people stop caring.

The useful spot is somewhere just above what customers were probably going to spend already.

Close enough that one more thing gets you there.

Far enough that the retailer gets a bigger order.

That is why the threshold can feel suspiciously achievable.

Your cart is $84.

Free shipping is $100.

You are basically there.

So now you are scrolling through the website looking for a $16 thing you never planned to buy.

You can see people changing their cart around it

There is some good research behind this too.

A 2026 study of a large ecommerce platform found that customers without free-shipping memberships tended to bunch their purchases around the free-shipping threshold.

Once people had free-shipping memberships and the threshold disappeared, their behaviour changed.

Orders became smaller and more frequent.

That is pretty revealing.

Take away the threshold and people buy differently.

Put it back and suddenly everyone is trying to land on the magic number.

But there is a point where people just stop chasing it

Retailers can push this too far.

Research looking at an online grocery platform found that when its free-shipping threshold increased from $80 to $100, customer spending fell 19.4%.

People bought fewer products and purchased less often.

So the threshold is not some infinite money machine.

If it feels achievable, people chase it.

If it feels annoying, they stop.

That is the balance the retailer is trying to find.

The shipping was never really free

The courier still gets paid.

Someone still packs the box.

There is still packaging, warehousing, labour and transport.

None of that disappears because the website says “free shipping”.

The retailer is just trying to recover that cost somewhere else.

Maybe through the margin on the extra item you added.

Maybe through higher product prices.

Maybe by making the order big enough that absorbing delivery is worth it.

The word “free” just makes the trade feel better.

And that is why the little progress bar in your cart is so effective.

You went in to buy one thing.

You added another just to avoid paying for delivery.

And somehow you still feel like you saved money.